Henbt lockwood



r is

UNITED sTATEs PATENT oEEicE.

HENRY LOCKWOOD, OF NEW YORK, N. Y.

Doon-Loox.

Specification of Letters Patent No. 28,092, dated May 1, 1860.

To all whom 'it may concern:

Be it known that I, HENRY LooKwooD, of New York, in the county and Stateof New York, have invented a new and Improved Lock; and I do herebydeclare that the followin is a full and exact description thereof, reerence being had to the accompanying drawings, and to the letters ofreference marked thereon.

Figure I represents an internal view of the lock with the back plateremoved. Fig. II represents the lock covered ready for attachment to thedoor. Fig. III is a section at line (l, 2).

A is the bolt, acted upon by a spiral spring, S, and provided with a pinpassing through the front side of the casing to which a knob (K) isattached to operate said bolt by hand.

B is a frame attached to the lock casing, on one end of which acylinder, C, is iXed, capable of turning. This cylinder (C) is providedwith a center. pin (D) passing through the frame B and front plate ofthe lock case, and acting as a center for the cylinder, C, to turnupon.` A projection, N, is made on this cylinder acting against aprojection (mf) on the bolt A, in such a manner, that the turning ofsaid cylinder, C, will push the bolt A back. Through the frame B andthis cylinder, C, two holes are cut, corresponding exactly with eachother, and into which plugs or pins, fr, c', are fitted, capable ofmoving easily up or down and acted upon by springs, n, situated on theunderside of the frame B, so as to press those plugs or pins against thetop, J, of the cylinder, C. This top piece, J, is provided with alongitudinal slot, fw, directly above the pins fu, o', for the key topass through. The key, (which is represented in Fig. IV) is made withtwo projections fr, m of unequal length. The plugs or pins 'v and o areeach made in two parts, of such a length that when the key is inserted,and the same pressed down, the division of said pins o, e will beexactly in a line with the bottom surface of the cylinder, C, in whichcase said cylinder, can easily be turned around, and act then by meansof the projection, N, upon the bolt A, so as to draw the same back asabove described. If a false key is inserted having the least variationin the length of its projections m or m the division of these plugs, o,v', will be brought either above or below the bottom surface of thecylinder, C, and consequently prevent the turning of said cylinder andthe opening of bolt.

Instead of springs bearing against the bottom of the plugs which areattached to the underside of the frame 'B as above described, spiralsprings may be placed in the bottom of the holes directly underneath theplugs, and the number 0f the plugs or pins may be increased to anynumber desired.

The back plate E is provided with a cap piece F which coversthecylinder, C, and passes through t-he wood of the door. The endplate hasan opening corresponding with the opening in the piece, J, and enlargedin the center for the shank of the key to turn in. By this arrangementthe key, after having pushed back the plugs, so as to turn the cylinderand pull thereby the bolt back, is covered over and cannot be withdrawn,from the keyhole, preventing thereby any possibility of measuring thelength of the projections and of the key, and as soon as the key isagain in a position to be withdrawn the holes in the frame B andcylinder C correspond with each other, so that the lower parts of theplugs o, fu, are through the action of their springs pushed upward, andmove thereby the upper parts of said plugs against the top piece, J, ofthe cylinder C.

What I claim as my invention and desire to secure by Letters Patent, is

l. The arrangementof a number of plugs or pins in combination with arevolving cylinder and a Xed frame when said cylinder acts directly onthe bolt, while turning in the manner and for the purpose as described.

2. I further claim the arrangement of the cap plate F so constructed asto cover the key, as soon as the same shall begin to turn the cylindersubstantially as setforth.

' H. LOCKW OOD.

Witnesses:

HENRY E. ROEDER, J As. II. DAVIDSON.

